Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dacf3cef2b32405…

MALICIOUS

PDF

84.3 KB Created: 2021-07-16 12:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7e2fb5a8fb061da93c54b2713093c7c SHA-1: 3f4438ddbd61a196e23d654b466b82baa09367b5 SHA-256: 1dacf3cef2b324054b9396075afbf8a5bd9139fa8866a6d4a848f73ccc851b40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://apcmagon.com/userfiles/tixewif.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba00a315d---lomifetegomuwo.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/18109230347.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/45471534119.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/75693576406.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988a813fa90---lamuturezuweviwaj.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acff4babe44---86103866750.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fdecb4ccfec6e059d532ee4c5fc814b4/vuluxusod.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f120e6f69b818ffe0c875d61fab1e72a/50290896044.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c970295e9de---62498360637.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/vinegix.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/ruvozisa.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/pubare.pdfIn PDF document text
    • http://ewtch.com/upload/files/50621378335.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/41676140065.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa908380bc---61832018927.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba1e67ef88---53133250003.pdfIn PDF document text
    • http://sjhtractor.com/d/files/dijuropagesigiwufewu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec45ceaf51c---gawunewiwadaz.pdfIn PDF document text
    • http://aurora-c.jp/files/files/33076516137.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e5162ed63bf1b4cf6c07059319515418/80125834349.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/tixewolevejatiwodi.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/fagijutezavasevazolawuvep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=feeding+red+wormsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 16688 bytes
SHA-256: a0bc668b4950eeb30fde73e86958ffa401ae88d6375b0a2fe8fa85119552dd56
font_01_sfnt_off000113c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 10348 bytes
SHA-256: 78ae5c50972f3206558979e2ce63409399ed681dcb038dcb2f512c6e537fb459
font_02_sfnt_off00012aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.